EP1272452A2 - Process for the preparation of (r)-2-bromo-3-phenyl-propionic acid - Google Patents
Process for the preparation of (r)-2-bromo-3-phenyl-propionic acidInfo
- Publication number
- EP1272452A2 EP1272452A2 EP01910211A EP01910211A EP1272452A2 EP 1272452 A2 EP1272452 A2 EP 1272452A2 EP 01910211 A EP01910211 A EP 01910211A EP 01910211 A EP01910211 A EP 01910211A EP 1272452 A2 EP1272452 A2 EP 1272452A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- phenylalanine
- amount
- equivalents
- bromo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- WDRSCFNERFONKU-MRVPVSSYSA-N (2r)-2-bromo-3-phenylpropanoic acid Chemical compound OC(=O)[C@H](Br)CC1=CC=CC=C1 WDRSCFNERFONKU-MRVPVSSYSA-N 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- COLNVLDHVKWLRT-MRVPVSSYSA-N D-phenylalanine Chemical compound OC(=O)[C@H](N)CC1=CC=CC=C1 COLNVLDHVKWLRT-MRVPVSSYSA-N 0.000 claims abstract description 23
- 229930182832 D-phenylalanine Natural products 0.000 claims abstract description 23
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims abstract description 18
- 150000003842 bromide salts Chemical class 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 9
- KOUKXHPPRFNWPP-UHFFFAOYSA-N pyrazine-2,5-dicarboxylic acid;hydrate Chemical compound O.OC(=O)C1=CN=C(C(O)=O)C=N1 KOUKXHPPRFNWPP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 150000007530 organic bases Chemical class 0.000 claims abstract description 8
- 235000010288 sodium nitrite Nutrition 0.000 claims abstract description 7
- LVRLSYPNFFBYCZ-VGWMRTNUSA-N omapatrilat Chemical compound C([C@H](S)C(=O)N[C@H]1CCS[C@H]2CCC[C@H](N2C1=O)C(=O)O)C1=CC=CC=C1 LVRLSYPNFFBYCZ-VGWMRTNUSA-N 0.000 claims abstract description 4
- 239000005541 ACE inhibitor Substances 0.000 claims abstract description 3
- 229940044094 angiotensin-converting-enzyme inhibitor Drugs 0.000 claims abstract description 3
- 239000007864 aqueous solution Substances 0.000 claims abstract description 3
- 238000011065 in-situ storage Methods 0.000 claims abstract description 3
- 229950000973 omapatrilat Drugs 0.000 claims abstract description 3
- UOVSNFYJYANSNI-JTQLQIEISA-N (2s)-2-acetylsulfanyl-3-phenylpropanoic acid Chemical compound CC(=O)S[C@H](C(O)=O)CC1=CC=CC=C1 UOVSNFYJYANSNI-JTQLQIEISA-N 0.000 claims abstract 4
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 claims abstract 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 42
- 239000002585 base Substances 0.000 claims description 10
- -1 heterocyclic amine Chemical class 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 2
- 150000003973 alkyl amines Chemical class 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000008096 xylene Substances 0.000 claims description 2
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims 2
- 239000011541 reaction mixture Substances 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000002253 acid Substances 0.000 description 10
- 239000012071 phase Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 5
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 239000008346 aqueous phase Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- FPBDWDNHMDLSFG-UHFFFAOYSA-N CC(C([O-])=O)C1=CC=C[S+]1C(C)=O Chemical compound CC(C([O-])=O)C1=CC=C[S+]1C(C)=O FPBDWDNHMDLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 239000004133 Sodium thiosulphate Substances 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000010533 azeotropic distillation Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 229910001622 calcium bromide Inorganic materials 0.000 description 1
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D513/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00
- C07D513/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00 in which the condensed system contains two hetero rings
- C07D513/04—Ortho-condensed systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C327/00—Thiocarboxylic acids
- C07C327/20—Esters of monothiocarboxylic acids
- C07C327/32—Esters of monothiocarboxylic acids having sulfur atoms of esterified thiocarboxyl groups bound to carbon atoms of hydrocarbon radicals substituted by carboxyl groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
- C07C51/363—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by introduction of halogen; by substitution of halogen atoms by other halogen atoms
Definitions
- the invention relates to a process for the preparation of (R)-2- bromo-3-phenylpropionic acid starting from D-phenylalanine, sodium nitrite and a bromine compound in an aqueous solution.
- a process for the preparation of (R)-2- bromo-3-phenylpropionic acid starting from D-phenylalanine, sodium nitrite and a bromine compound in an aqueous solution is known from WO-A-99/42431.
- the invention aims to eliminate the above-mentioned drawback.
- (R)-2-bromo-3-phenylpropionic acid is a suitable intermediate in the preparation of pharmaceuticals, for instance in the preparation of ACE inhibitors, for instance Omapatrilat (known under the commercial name Vanlev), or similar pharmaceuticals.
- ACE inhibitors for instance Omapatrilat (known under the commercial name Vanlev), or similar pharmaceuticals.
- the process according to the invention is carried out in the presence of HBr and of a bromide salt.
- suitable bromide salts are alkali metal or alkaline earth metal salts of HBr, for instance NaBr, KBr or CaBr 2 .
- HBr and bromide salt a more than equivalent amount of Br " (HBr and bromide salt) is used, preferably 3-10 equivalents, more in particular 4-8 equivalents of Br " calculated relative to the total amount of D-phenylalanine. In principle it is possible to use larger amounts of Br " , but this does not yield any significant advantage.
- the amount of bromide salt depends on the desired excess of Br " and preferably lies between 0.5 and 7 equivalents, in particular between 1.5 and 3 equivalents, calculated relative to the total amount of D-phenylalanine.
- At least a part of the bromide salt is formed in situ from HBr and a base.
- suitable bases that can be used for this purpose are alkali metal hydroxides, carbonates or bicarbonates.
- KOH or NaOH is used as base.
- the amount of base to be used depends on the desired excess of Br " and the desired amount of bromide salt, and preferably lies between 0.5 and 7, in particular between 1.5 and 3 equivalents, calculated relative to the total amount of D-phenylalanine
- the amount of sodium nitrite to be used preferably lies between 0 8 and 2 equivalents, in particular between 1 and 1 6 equivalents of sodium nitrite, calculated relative to the total amount of D-phenylalanine
- the process according to the invention is preferably carried out in the presence of an organic solvent, for instance a hydrocarbon, preferably a (halogenated) aromatic hydrocarbon
- an organic solvent for instance a hydrocarbon, preferably a (halogenated) aromatic hydrocarbon
- xylene or toluene is used as organic solvent
- the (R)-2-bromo-3-phenylprop ⁇ on ⁇ c acid that is obtained can subsequently, optionally without intermediate isolation, be converted in a known way into (S)-2-acetylth ⁇ o-3-phenylprop ⁇ on ⁇ c acid using thioacetic acid in the presence of an alkali metal carbonate or bicarbonate, for instance sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate, or with an alkali metal salt of thioacetic acid
- an organic base instead of an alkali metal (b ⁇ )carbonate
- Suitable examples of such a base are alkylamines, in particular t ⁇ alkylamines, heterocyclic amines in particular py ⁇ dines, and (alkyl)an ⁇ l ⁇ nes
- t ⁇ ethylamine is used The reason for this is that it has, surprisingly, been found that in this way the amount of by-product obtained is significantly lower and thus the efficiency higher
- the temperature at which this reaction is carried out preferably lies between -10 and +30°C, in particular between -5 and +10°C
- the amount of thioacetic acid to be added preferably lies between 0 8 and 2 equivalents, in particular between 0 9 and 1 ,6 equivalents, calculated relative to the total amount of D-phenylalanine, or between 1 and 2 equivalents, in particular between 1 1 and 1 7 equivalents, calculated relative to the total amount of (R)-2-bromo-3-phenylprop ⁇ on ⁇ c acid
- the amount of organic base to be added preferably lies between 0 8 and 2 equivalents, in particular between 1 and 1 8 equivalents, calculated relative to the total amount of D-phenylalanine, or between 1 and 2 equivalents, in particular between 1 2 and 1 8 equivalents, calculated relative to the total amount of (R)-2-bromo-3-phenylprop ⁇ on ⁇ c acid
- the organic base and the excess thioacetic acid can be removed, for instance by extraction at a pH between 0 and 4
- reaction mixture was heated to 10°C Stirring was continued for another 4 hours until the conversion as determined by HPLC was complete 95 ml of water was added to the reaction mixture and the reaction mixture was heated to 20°C
- the pH of the reaction mixture was adjusted to 0 75 using 32% HCI Then the aqueous phase was separated off and the toluene phase was again extracted with 95 ml of water
- the toluene phase was concentrated to 150 ml by evaporation and filtered at a temperature of about 40°C
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Process for the preparation of (R)-2-bromo-3-phenylpropionic acid starting from D-phenylalanine, sodium nitrite and HBr in an aqueous solution, the reaction being carried out in the presence of a bromide salt, at a temperature between -10 and 30 °C. The total amount of HBr plus bromide salt lies between 3 and 10 equivalents, calculated relative to the amount of D-phenylalanine, preferably between 4 and 8 equivalents, the amount of bromide salt ranging from 0.5 to 7 equivalents, calculated relative to the amount of D-phenylalanine. The bromide salt is preferably formed in situ from HBr and a base, for instance KOH or NaOH. Preferably, the (R)-2-bromo-3-phenylpropionic acid obtained is subsequently converted into (S)-2-acetylthio-3-phenylpropionic acid using thioacetic acid and an organic base, for instance thriethylamine. The (S)-2-acetylthio-3-phenylpropionic acid obtained can be converted into a pharmaceutical, in particular an ACE inhibitor, for instance Omapatrilat.
Description
PROCESS FOR the PREPARATION OF (R)-2-BROMO-3-PHENYL-PROPIONIC ACID
The invention relates to a process for the preparation of (R)-2- bromo-3-phenylpropionic acid starting from D-phenylalanine, sodium nitrite and a bromine compound in an aqueous solution. Such a process is known from WO-A-99/42431.
A drawback of the known process is that the reaction must be carried out at a low temperature.
The invention aims to eliminate the above-mentioned drawback.
This is achieved according to the invention by carrying out the reaction in the presence of a bromide salt. In the process according to the invention, moreover, less byproduct and a higher yield can be obtained.
(R)-2-bromo-3-phenylpropionic acid is a suitable intermediate in the preparation of pharmaceuticals, for instance in the preparation of ACE inhibitors, for instance Omapatrilat (known under the commercial name Vanlev), or similar pharmaceuticals.
The process according to the invention is carried out in the presence of HBr and of a bromide salt. Examples of suitable bromide salts are alkali metal or alkaline earth metal salts of HBr, for instance NaBr, KBr or CaBr2. As a rule a more than equivalent amount of Br" (HBr and bromide salt) is used, preferably 3-10 equivalents, more in particular 4-8 equivalents of Br" calculated relative to the total amount of D-phenylalanine. In principle it is possible to use larger amounts of Br", but this does not yield any significant advantage. The amount of bromide salt depends on the desired excess of Br" and preferably lies between 0.5 and 7 equivalents, in particular between 1.5 and 3 equivalents, calculated relative to the total amount of D-phenylalanine.
In a particularly suitable embodiment at least a part of the bromide salt is formed in situ from HBr and a base. Examples of suitable bases that can be used for this purpose are alkali metal hydroxides, carbonates or bicarbonates. Preferably, KOH or NaOH is used as base. The amount of base to be used depends on the desired excess of Br" and the desired amount of bromide salt, and preferably lies between 0.5 and 7, in particular between 1.5 and 3 equivalents, calculated relative to the total
amount of D-phenylalanine
Applicant has found that the process according to the invention can be carried out at higher temperatures than the temperatures described for the prior art processes At higher temperatures less energy is required Moreover the reaction can be performed at higher concentration The conversion of D- phenylalanine into (R)-2-bromo-3-phenylpropιonιc acid is carried out at a temperature between -10 and 30°C, for instance between -10 and 20°C preferably between -5 and 20°C, for instance between -5 and 10°C
The amount of sodium nitrite to be used preferably lies between 0 8 and 2 equivalents, in particular between 1 and 1 6 equivalents of sodium nitrite, calculated relative to the total amount of D-phenylalanine
The process according to the invention is preferably carried out in the presence of an organic solvent, for instance a hydrocarbon, preferably a (halogenated) aromatic hydrocarbon Preferably, xylene or toluene is used as organic solvent
The (R)-2-bromo-3-phenylpropιonιc acid that is obtained can subsequently, optionally without intermediate isolation, be converted in a known way into (S)-2-acetylthιo-3-phenylpropιonιc acid using thioacetic acid in the presence of an alkali metal carbonate or bicarbonate, for instance sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate, or with an alkali metal salt of thioacetic acid Preferably, however this reaction is carried out with an organic base instead of an alkali metal (bι)carbonate Suitable examples of such a base are alkylamines, in particular tπalkylamines, heterocyclic amines in particular pyπdines, and (alkyl)anιlιnes Preferably, tπethylamine is used The reason for this is that it has, surprisingly, been found that in this way the amount of by-product obtained is significantly lower and thus the efficiency higher
In the preparation of (S)-2-acetylthιo-3-phenylpropιonιc acid from (R)-2-bromo-3-phenylpropιonιc acid the organic base is preferably dosed to a mixture of (R)-2-bromo-3-phenylpropιonιc acid and thioacetic acid In principle it is also possible to use a differ rent dosing sequence
The temperature at which this reaction is carried out preferably lies between -10 and +30°C, in particular between -5 and +10°C
The amount of thioacetic acid to be added preferably lies between 0 8 and 2 equivalents, in particular between 0 9 and 1 ,6 equivalents,
calculated relative to the total amount of D-phenylalanine, or between 1 and 2 equivalents, in particular between 1 1 and 1 7 equivalents, calculated relative to the total amount of (R)-2-bromo-3-phenylpropιonιc acid
The amount of organic base to be added preferably lies between 0 8 and 2 equivalents, in particular between 1 and 1 8 equivalents, calculated relative to the total amount of D-phenylalanine, or between 1 and 2 equivalents, in particular between 1 2 and 1 8 equivalents, calculated relative to the total amount of (R)-2-bromo-3-phenylpropιonιc acid
After the reaction the organic base and the excess thioacetic acid can be removed, for instance by extraction at a pH between 0 and 4
The invention will now be elucidated on the basis of the examples, without however being limited by this
Example I Preparation of R-2-bromo-3-phenylpropionic acid
46 0 ml of water was introduced into a 1 -litre double-walled glass reactor connected to a cooling medium
275 5 g of 48% HBr was added The jacket cooling and stirring were started Subsequently, 67 7 g of 45% KOH was slowly added The reaction mixture was cooled to 30-40°C
45 0 g of D-phenylalanine was added to the reaction mixture Next, 213 ml of toluene was added to the reaction mixture The reaction mixture was cooled to 3°C
In 6 hours 95 9 g of NaN02, a 30% solution in water, was added to the reaction mixture The temperature was kept at 5°C After the reaction stirring was continued for 3 hours at 3°C
The reaction mixture was heated to 20°C Stirring was stopped and the aqueous phase was separated off
Then the toluene phase was extracted twice with 95 ml of water The reaction mixture was heated to 70°C and a 100 mbar vacuum was created using a vacuum pump The water was removed by distillation using a Dean Stark apparatus until the toluene phase was free of water Yield 84 0% R-2-bromo-3-phenylpropιonιc acid in the toluene solution, relative to D-phenylalanine
Preparation of S-acetylthiophenylpropionic acid
The toluene solution of R-2-bromo-3-phenyl-propιonιc acid prepared from 45 0 g of D-phenylalanine was cooled to 0°C Next, 27 0 g of thioacetic acid was added In 6 hours 38 5 g of tπethylamine was dosed to the reaction mixture at a temperature of 0°C
Then the reaction mixture was heated to 10°C Stirring was continued for another 4 hours until the conversion as determined by HPLC was complete 95 ml of water was added to the reaction mixture and the reaction mixture was heated to 20°C
32% HCI was used to adjust the pH of the reaction mixture to 3 4 Stirring was stopped and the water was separated off
Then the reaction mixture was washed with 95 ml of sodium thiosulphate solution (5%)
The pH of the reaction mixture was adjusted to 0 75 using 32% HCI Then the aqueous phase was separated off and the toluene phase was again extracted with 95 ml of water
With the aid of a Dean Stark apparatus the water was removed by azeotropic distillation at 60°C and a pressure of 100 mbar until the toluene phase was water-free
The toluene phase was concentrated to 150 ml by evaporation and filtered at a temperature of about 40°C
At 40°C 360 ml of special boiling point gasoline 80-110 was added, followed by cooling to 0°C
Yield 410 g ≡ 67 1 % relative to D-phenylalanine
Example II
Preparation of R-2-bromo-3-phenylpropionic acid The reaction is performed in a 1 -litre double-walled glass reactor connected to a cooling medium provided with a pitch blade turbine stirrer
72 0 g of D-phenylalanine was introduced into the reactor 442 g of 48% HBr was added The jacket cooling and stirring were started Subsequently, 113 g of 45% KOH was slowly added
The reaction mixture was cooled to 20°C.
Next, 330 ml of toluene was added to the reaction mixture.
In 5 hours 90.56 ml of NaNO2, a 34.7 wt% solution in water (39.09 g NaNO2), was added to the reaction mixture. The reaction mixture was kept at an internal temperature of 20°C. After the reaction stirring was continued for 1 hour at 20°C.
Stirring was stopped and the aqueous phase was separated off.
Then the toluene phase was extracted twice with 160 ml of water. The reaction mixture was heated to 70°C and a 100 mbar vacuum was created using a vacuum pump. The water was removed by distillation using a Dean Stark apparatus until the toluene phase was free of water. The toluene phase was concentrated by evaporation at 50°C and 50 mbar whereby 94.2 g crystallized oil was obtained. Content of R-2-bromo-3-phenylpropionic acid herin was 89.1 wt% corresponding to 84.1 mol% R-2-bromo-3-phenylpropionic acid relative to D-phenylalanine.
Claims
1. Process for the preparation of (R)-2-bromo-3-phenylpropionic acid starting from D-phenylalanine, sodium nitrite and HBr in an aqueous solution, characterized in that the reaction is carried out in the presence of a bromide salt, at a temperature between -10 and 30°C.
2. Process according to claim 1 in which the total amount of HBr plus bromide salt lies between 3 and 10 equivalents, calculated relative to the amount of D-phenylalanine.
3. Process according to claim 2 in which the amount of HBr plus bromide salt lies between 4 and 8 equivalents, calculated relative to D- phenylalanine.
4. Process according to any one of claims 1-3 in which the amount of bromide salt lies between 0.5 and 7 equivalents, calculated relative to the amount of D-phenylalanine.
5. Process according to any one of claims 1-4 in which at least a part of the bromide salt is formed in situ from HBr and a base.
6. Process according to claim 5 in which an alkali metal hydroxide, carbonate or bicarbonate is used as base.
7. Process according to claim 6 in which KOH or NaOH is used as base.
8. Process according to any one of claims 5-7 in which the total amount of base used lies between 0.5 and 7 equivalents relative to the total amount of D-phenylalanine.
9. Process according to any one of claims 1-8 in which the temperature lies between -5°C and +20°C.
10. Process according to any one of claims 1-9 in which the amount of sodium nitrite lies between 1 and 1.4 equivalents of sodium nitrite, calculated relative to the amount of D-phenylalanine.
1 . Process according to any one of claims 1-10 in which the reaction is carried out in the presence of an organic solvent.
12. Process according to claim 11 in which toluene or xylene is used as organic solvent.
13. Process according to any one of claims 1-12 in which the (R)-2-bromo-3- phenylpropionic acid obtained is subsequently converted into (S)-2-
acetylthio-3-phenylpropionic acid using thioacetic acid and an organic base.
14. Process according to claim 10 in which an alkylamine, a heterocyclic amine or an (alkyl)aniline is used as organic base.
15. Process according to claim 14 in which triethylamine is used as organic base.
16. Process according to any one of claims 13-15 in which the base is dosed to a mixture of (R)-2-bromo-3-phenylpropionic acid and thioacetic acid at a temperature between -10°C and +30°C.
17. Process according to any one of claims 13-16 in which the (S)-2- acetylthio-3-phenylpropionic acid obtained is converted into a pharmaceutical, in particular an ACE inhibitor, for instance Omapatrilat.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1014353 | 2000-02-11 | ||
| NL1014353A NL1014353C2 (en) | 2000-02-11 | 2000-02-11 | Process for the preparation of (R) -2-bromo-3-phenylpropanoic acid. |
| PCT/NL2001/000079 WO2001058837A2 (en) | 2000-02-11 | 2001-02-02 | Process for the preparation of (r)-2-bromo-3-phenyl-propionic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1272452A2 true EP1272452A2 (en) | 2003-01-08 |
Family
ID=19770797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01910211A Withdrawn EP1272452A2 (en) | 2000-02-11 | 2001-02-02 | Process for the preparation of (r)-2-bromo-3-phenyl-propionic acid |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US20030125575A1 (en) |
| EP (1) | EP1272452A2 (en) |
| JP (1) | JP2003522746A (en) |
| CN (1) | CN1416414A (en) |
| AU (1) | AU2001237791A1 (en) |
| CA (1) | CA2399515A1 (en) |
| CZ (1) | CZ20022709A3 (en) |
| HU (1) | HUP0204450A2 (en) |
| NL (1) | NL1014353C2 (en) |
| WO (1) | WO2001058837A2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10212198A1 (en) * | 2002-03-19 | 2003-10-02 | Aventis Pharma Gmbh | Ethane-1-diaminium-bis (2R) -2-bromo-3-phenylpropanoate), process for its preparation and its use |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5508272A (en) * | 1993-06-15 | 1996-04-16 | Bristol-Myers Squibb Company | Compounds containing a fused bicycle ring and processes therefor |
| IT1298268B1 (en) * | 1998-02-18 | 1999-12-20 | Zambon Spa | PROCEDURE FOR THE PREPARATION OF THE (S) -2-BROMO-3-PHENYL-PROPIONIC ACID |
| IL138688A0 (en) * | 1998-04-23 | 2001-10-31 | Novartis Ag | Certain heteroaryl substituted thiol inhibitors of endothelin-converting enzyme |
-
2000
- 2000-02-11 NL NL1014353A patent/NL1014353C2/en not_active IP Right Cessation
-
2001
- 2001-02-02 EP EP01910211A patent/EP1272452A2/en not_active Withdrawn
- 2001-02-02 HU HU0204450A patent/HUP0204450A2/en unknown
- 2001-02-02 CN CN01804766A patent/CN1416414A/en active Pending
- 2001-02-02 CA CA002399515A patent/CA2399515A1/en not_active Abandoned
- 2001-02-02 WO PCT/NL2001/000079 patent/WO2001058837A2/en not_active Application Discontinuation
- 2001-02-02 CZ CZ20022709A patent/CZ20022709A3/en unknown
- 2001-02-02 AU AU2001237791A patent/AU2001237791A1/en not_active Abandoned
- 2001-02-02 US US10/203,694 patent/US20030125575A1/en not_active Abandoned
- 2001-02-02 JP JP2001558390A patent/JP2003522746A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0158837A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2399515A1 (en) | 2001-08-16 |
| JP2003522746A (en) | 2003-07-29 |
| NL1014353C2 (en) | 2001-08-15 |
| WO2001058837A2 (en) | 2001-08-16 |
| US20030125575A1 (en) | 2003-07-03 |
| CN1416414A (en) | 2003-05-07 |
| WO2001058837A3 (en) | 2002-02-28 |
| CZ20022709A3 (en) | 2002-11-13 |
| AU2001237791A1 (en) | 2001-08-20 |
| HUP0204450A2 (en) | 2003-04-28 |
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